Balanced valve



2 Sheets-Sheet 1.

PatentedJune z8', 1881 y @u (No Model.)

L. A. HAINES. BALANGED VALVE. N0. 365,680.

WIL/www5 d6 3. WM-

(NoModel.) 2 Shets-Sheet 2. v

L. A. HAINES. BALANUED VALVE.

No. (365,680. Patented June Z8, 1887.

NA PEYERS, Pholo-Lhogmphnr. Walhingnn'. D. (I.

IINiTED STATES PATENT rrrcn.

LEVIS A. HAINES, OF HARRISBURG, PENNSYLVANIA.

sALANcl-:D VALVE.

SPECIFICATION forming part of Letters Patent No. 365,680, dated June 28, 1887.

Application filed Api-i12, 1887. Serial No. 233,438. (No model.)

To all whom, it 11i/ary concern:

Be it known that I, LEWIS A. HAINES, a citizen of the United States, residing at Harrisburg, in the county of Dauphin and State of Pennsylvania, have invented certain new and useful Improvements in Balanced Valves; and I do declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which itappertains to make and use the same, reference being had to the accompanying drawings, and to letters or figures of reference marked thereon, which form a part of this specification.

Figure l of the drawings is a vertical longitudinal section ofa cylinder and steam-chest, showing my improved balanced Valve. Fig. 2 is a sectional view of pressure plate and slice. Fig. 3 is a detail view of shoe. Fig. 4 is a front view and an end view of pressureplate. Fig. 5 is a horizontal transverse section of cylinder and steam-chest; Fig. 6, a detail View of steam-chest; Fig. 7, a detail and sectional viewv of valve; Fig. 8, a detail and sectional view of pressure-plate.

The invention relates to improvements in balanced valves, the object being to take up the wear of the valve and keep the joint between the valve and its seat tight; and it consists in the construction and arrangement of a spring-controlled shoe fitted to and movable upon the pressure-plate above the valve, and in the combination of the same with certain other parts, as hereinafter set forth.

Referring to the drawings, A designates the cylinder, B the piston with its rod attached, C the steam-chest, c c the steam-ports, and c' the exhaust.

D is the valve, with its stem passing through astuffing-box in the usual manner. The valve is rectangular in form, having the central eX- haust-opening, d, and the steam-passages in openings d d near its ends.

d2 is a central longitudinal sleeve or tube forming part of the valve and having the end part of the valve-stem secured lwithin it-,as shown.

E is the pressure-plate, rectangular in form and su fiieiently wide to have its side edges rest upon the edges of the walls e e, rising on each side of the valve-seate, and between which walls the valve is fitted, as shown. The said pressure-plate E has a central exhaust-chamber, e2, and the similar steam-channels e e3 in its front and rear edges,registering with or opposite to the orifices of the steam-ports c c, and having the same width as said openings.

F is a coiled spring resting in a central circular recess in the outer surface of the pressure-plate, an inwardly standing boss being formed integrally with said plate, in which to make said recess. The said spring keeps the pressure-plate pressed on the edges of the walls e, which are iush with the upper surface of the valve. The pressure-plate is held in place laterally by abutting against the shoulders ff on the interior of thel steam-chest, and from front to rear by abutting against the shoulders ff within the same.

G is a shoeV rectangular in shape and provided at its rear and front ends with the outwardly-standing fianges g g, between which the inwardly-standing flanges g g on the front and rear ends of the pressure-plate are htted.

gZ g2 are steam spaces or openings in the f ront and rear parts of the shoe, which spaces are continuous with the steam-channels e3 e of the pressure-plate. The side edges, h h, of the shoe are fitted between the inwardly-standing side flanges, H H, of the pressure-plate, which danges rest upon the walls e e on each side of the valve-seat e. The pressure-plate has at its corners the recesses I, in which the coiled springs J bear down on the platesjj, which lie upon the shoe between the iianges g g, so

that the shoe can be forced inward in relation to the pressure-plate. The tops ofthe fianges g g are preferably rounded, as shown in the drawings, and the joint K between the upper side of the shoe and lower side of the pressureplate is sufficiently open to receive steam.

When the parts are fitted together and in operation, the steam-pressure on theinner and outer ends of the anges q will be equal and balance, and the steam-pressure in the joint K will at all times balance the pressure upon the parts of the edges of' the flanges g of the pressure-plate that are outward from 'the steamopenings g2, for when the parts e and openings gz are open to receive live steam the latter will fill the joint K, and when the ports and openings are closedl the compressed steam flowing IOD Y from the cylinder will ll said joint. Vhcn either port begins to take steam,thelatter flows both directly into the port to thc inner side ofthe valve, and also to the outer side of the valve into the opening g, so that the same amount of valve movement gives double the valve-opening than in the ordinary slide-valve.

The shoe cannot Vbe moved from its seat by the compressed steam passing out of the steamports, as the said steam passes through the openings in the shoe, and its pressure acts Yupon the pressure-plate, which is backed by steam in the steam-chest.

Having described this invention, what I claim, and desire to secure by Letters Patent, 1S* Y 1. The combination,with the balanced slide- Valve, of a pressure-plate and a shoe guided by the pressure-plate and automatically moved inward thereon by springs, so as to bear on the valve, take up the wear of the same, and maintain the joints between the valve and its outer and inner seats steam-tight, substantially as specified.

2. The combination, with the balanced slidevalve, of a pressure-plate and a shoe guided by the pressure-plate and movable toward the valve thereon, whereby the wear of the valve is taken up and the joints between the valve and its inner and upper seats are mantaine steam-tight, substantially as specified.

3. The combination, with the balanced slidevalve having ksteam and exhaust openings through it, of a pressure plate and ashoe guided by and movable toward the valve on the pressure-plate and provided with steamchannels registering with the orifices of the Vsteam-ports, so that the ports will take steam directly, and also throughthe channels in the shoe, substantially as specified.

4. The combination, with the twofaced balanced valve, of the shoeV on the outer face of said valve, and means, substantially as described, whereby the shoe is equally balanced at all points of the valve travel, substantially as specied.

5. The combination, with the two-faced balanced valve having the exhaust and steam openings through it, of the shoe provided with steam-openings to properly register with the steam-ports ofthe cylinder-,and the pressureplate outside of the shoe and kept to its seat thereon by springs, substantially as specified.

`6. The combination, with a balanced valve having steam and exhaust openings through it, of the pressure-plate kept to its seat by a.

spring or springs, and the shoe provided with the anges 'g g, which lit each end of the pressure-plate, forming ajoint therewith,into which steam enters to balance the shoe, substantially as specified.

7. The combination, with a balanced valve,A of the pressure-plate, the shoe guided by said plate, and the springs J in the recesses I ofthe pressure-plate, bearing on the plates j, which rest upon the shoe, substantially as specied.

-In testimony whereof I affix my signature in presence of two witnesses.

LEWIS A. HAINES.'

Witnesses:

THEO. MUNGEN, PHIL C. MAsr. 

